E2.13 Joule-Thompson Coefficient

Example 2.13: Calculate Joule-Thompson coefficient of hydrogen when it is expanded from 20 bar to 5 bar at 100 °K. Critical pressure and critical temperature are 12.5 atm and 23.25 °K, respectively.

Solution

Initial enthalpy, h (20 bar and 100 °K) = 1546 J/g.

Final temperature (5 bar and 1546 J/g) = 98.03 °K.

Joules-Thompson coefficient μ_j (Equation 2.43):